Paper Key : IRJ************434
Author: Mahesh Vitthal Kharade,Yuvraj Ramchandra Patil,Sandeep Prabhakar Gaikwad,Prasad Ramchandra Kulkarni
Date Published: 14 Jan 2023
Abstract
Resonance frequency problems are often encountered in mechanical systems. When this occurs, the level of vibration is generally quite high, and this in turn often causes premature failure of machine components. Often, attempts are made to address the rotating elements and aligning coupled components. It is very important to maintain good balance and alignment. However in case of resonant conditions, the primary problem is generally not the magnitude of forcing function. The problem is that the forcing function, which may be of modest magnitude, matches a system resonance of natural frequency. General analysis of vibrating system is based on undamped forced vibrations. This analysis comprises determination of natural frequency of the system. Care should be taken in avoiding matching of this frequency with the frequency of external excitation and thus machines or machine parts are avoided from subjecting them to resonance conditions. Determination of effective mass and spring stiffness is a crucial part in the analysis. In complicated machinery where system may have many components interconnected to each other, it is difficult to determine effective mass directly. This can be carried out by preparing mathematical model to find effective mass of the system. The stiffness of the system may be found out by subjecting it to a known static force and measuring its deflection. When it not feasible to impart static force on the system, data from Impact hammer test may be employed. We have done a case study of worm and wheel type gear box . The objective is to control vibrations in a worm and worm wheel type gear box by addition of the effective mass. The effective mass is relatively small part of the entire system. So it can be made possible to reduce the level of vibration with relatively small mass and simple in shape at required position on a gear box. Thus the resonance conditions in gear box can be controlled in a better way. Impact hammer test for the gear box, is performed and results obtained will be used to determine equivalent stiffness and the magnitude of required effective mass to shift the resonance from the present gear mesh frequency. It was observed that a change in a resonance condition will be confirmed by performing the Impact hammer test after adding the required effective mass.
DOI LINK : 10.56726/IRJMETS32867 https://www.doi.org/10.56726/IRJMETS32867